The Human Eye Can Readily Detect Wavelengths from About 400 nm to 700 nm

Question: The human eye can readily detect wavelengths from about 400 nm to 700 nm. If white light illuminates a diffraction grating having 750 line/mm, over what range of angles does the visible m = 1 spectrum extend?

Answer: 

the human eye can readily detect wavelengths from about 400 nm to 700 nm

Result: 

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